JPS63163177A - Detection of momentary voltage drop - Google Patents
Detection of momentary voltage dropInfo
- Publication number
- JPS63163177A JPS63163177A JP61313116A JP31311686A JPS63163177A JP S63163177 A JPS63163177 A JP S63163177A JP 61313116 A JP61313116 A JP 61313116A JP 31311686 A JP31311686 A JP 31311686A JP S63163177 A JPS63163177 A JP S63163177A
- Authority
- JP
- Japan
- Prior art keywords
- voltage drop
- voltage
- circuit
- value
- instantaneous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 7
- 230000010354 integration Effects 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、瞬時電圧低下検出方法に関する。[Detailed description of the invention] <Industrial application field> The present invention relates to an instantaneous voltage drop detection method.
〈従来の技術〉
瞬時電圧低下補償装置、電圧変動補償装置等における瞬
時電圧低下の検出には電圧積分法が用いられている。<Prior Art> A voltage integration method is used to detect instantaneous voltage drops in instantaneous voltage drop compensators, voltage fluctuation compensators, and the like.
第4図は瞬時電圧低下補償装置を示し、1は商用電源、
2は送配電線、6はOA機器やコンピュータ等の負荷で
ある。Figure 4 shows the instantaneous voltage drop compensator, where 1 is a commercial power supply;
2 is a power transmission/distribution line, and 6 is a load such as OA equipment or a computer.
4は送配電線2の電圧で充電されるコンデンサ、5はこ
のコンデンサ4の蓄積電荷を商用周波の交流に変換する
インバータ、6はこの電圧を送配電線2に直列に注入す
る注入トランス、7は電圧変成器、8はインバータ5を
制御する制御回路で、電圧低下検出部8人及びコントロ
ール部8Bより成る。4 is a capacitor that is charged with the voltage of the power transmission and distribution line 2; 5 is an inverter that converts the accumulated charge of this capacitor 4 into commercial frequency alternating current; 6 is an injection transformer that injects this voltage into the power transmission and distribution line 2 in series; 7 8 is a voltage transformer, and 8 is a control circuit for controlling the inverter 5, which includes 8 voltage drop detection sections and a control section 8B.
而して、送配電線2に落雷等があり、瞬時電圧低下や断
(以下瞬低という)が発生すると、電圧低下検出部8人
が電圧低下中を検出し、コントロール部8Bをしてイン
バータ5を駆動し、前記低下中に見合った商用周波の交
流電圧をコンデンサ4の蓄積電荷から形成し、注入トラ
ンス6を介して送配電線2に加え直列補償を行なう。When there is a lightning strike or the like on the power transmission/distribution line 2 and an instantaneous voltage drop or disconnection (hereinafter referred to as an instantaneous voltage drop) occurs, the eight voltage drop detectors detect the voltage drop and control the control unit 8B to control the inverter. 5, a commercial frequency alternating current voltage commensurate with the drop is generated from the accumulated charge in the capacitor 4, and is applied to the power transmission/distribution line 2 via the injection transformer 6 for series compensation.
このため負荷3には所定の商用電圧が印加され続けるこ
ととなり、何ら支障を来たすことはない。Therefore, the predetermined commercial voltage continues to be applied to the load 3, and no trouble occurs.
ところで、前述の如き電圧低下検出部8Aとしては、上
述の通り電圧積分法を利用したものが知られている。By the way, as the voltage drop detection section 8A described above, one that utilizes the voltage integration method as described above is known.
第5図は、電圧積分法を説明するためのブロック図、第
6図は第5図のものの動作を説明するためのタイムチャ
ートである。第5図において、11は入力端子で、計器
用変成器7から送配電線2の電圧Vsが導かれている。FIG. 5 is a block diagram for explaining the voltage integration method, and FIG. 6 is a time chart for explaining the operation of the method shown in FIG. In FIG. 5, reference numeral 11 denotes an input terminal, from which the voltage Vs of the power transmission and distribution line 2 is led from the instrument transformer 7.
12は前記電圧Vsを入力とするPLL回路、16はP
LL回路12の出力を同期信号として基準正弦波■1を
発生する、基準正弦波発生回路、14は基準正弦波v1
を絶対値1v11回路であろう
16ハ両絶対値ノ差(1vS1−1v11=Δv10)
全作成する絶対値比較回路、17は前記差ΔV1oを零
点からピーク点、またピーク点から零点まで積分する様
一定時間毎(例えば電源周波数の1/4サイクル毎)に
PLL回路12からの信号でi゛セツトれる積分回路、
18は積分回路17の積分値が瞬時電圧低下の検出レベ
ルに達すると瞬時電圧低下が生じたと判断する瞬時電圧
低下判別回路であり、これらにより電圧低下検出部8人
が構成されている。12 is a PLL circuit whose input is the voltage Vs, and 16 is a PLL circuit.
A reference sine wave generation circuit generates a reference sine wave 1 using the output of the LL circuit 12 as a synchronization signal, 14 is a reference sine wave v1
The absolute value is 1v11 circuit, which is the difference between the two absolute values (1vS1-1v11=Δv10)
The absolute value comparison circuit 17 to be created is a signal from the PLL circuit 12 at fixed time intervals (for example, every 1/4 cycle of the power supply frequency) so as to integrate the difference ΔV1o from the zero point to the peak point and from the peak point to the zero point. i゛Set integral circuit,
Reference numeral 18 denotes an instantaneous voltage drop determination circuit that determines that an instantaneous voltage drop has occurred when the integral value of the integrating circuit 17 reaches the instantaneous voltage drop detection level, and these constitute eight voltage drop detection sections.
なお、第6図において、Qは前記ΔV10の積分値、L
は瞬時電圧低下判別回路18の検出レベル、Uは回路1
8の判別出力をそれぞれ示す。In addition, in FIG. 6, Q is the integral value of ΔV10, and L
is the detection level of the instantaneous voltage drop discrimination circuit 18, and U is the circuit 1
The discrimination outputs of 8 are shown respectively.
上述の構成による電圧積分法においては、送配電線2の
電圧Vsと、この電圧Vsに同期しその公称値に相当す
る振巾の基準正弦波v1とから、各絶対値の差Δv10
を求め、この差Δv10の所定時間積分値(零点からピ
ーク点、ピーク点から零点)Qが検出レベルLに達する
と瞬時電圧低下が生じたと判断している。第6図はこの
状態を示す。In the voltage integration method with the above configuration, the difference in absolute value Δv10 is calculated from the voltage Vs of the power transmission and distribution line 2 and the reference sine wave v1, which is synchronized with this voltage Vs and has an amplitude corresponding to its nominal value.
is determined, and when the predetermined time integral value (from the zero point to the peak point, from the peak point to the zero point) Q of this difference Δv10 reaches the detection level L, it is determined that an instantaneous voltage drop has occurred. FIG. 6 shows this state.
〈発明が解決しようとする問題点〉
この電圧積分法を用いると、積分値Qが検出レベルLに
達するまでの時間T1は判断出来ず、例えば、送配電線
2の10%の電圧低下を検出するよう検出レベルLを設
定した場合、100%の電圧低下が生じた時の検出最小
位相角は約25度(検出時間1.15m5ec = 6
0Hzベースで=)と、遅れを生ずるという問題があっ
た。<Problems to be Solved by the Invention> When this voltage integration method is used, the time T1 until the integral value Q reaches the detection level L cannot be determined, and for example, a 10% voltage drop in the power transmission and distribution line 2 cannot be detected. When the detection level L is set to
=) on a 0Hz basis, which caused a problem.
〈問題点を解決するための手段〉
本発明は、入力端子に与えられる電圧公称値にあたる波
形からそのピーク値点における瞬時電圧低下検出レベル
の値を常に差し引いて求まる波形を得て基準波形とし、
これと前記入力端子に与えられる波形とを瞬時値で比較
し瞬時電圧低下の検出をリアルタイムで行なう方法であ
る。<Means for solving the problem> The present invention obtains a waveform obtained by always subtracting the value of the instantaneous voltage drop detection level at the peak value point from the waveform corresponding to the nominal voltage value applied to the input terminal, and uses it as a reference waveform.
This is a method of comparing instantaneous values with the waveform applied to the input terminal to detect an instantaneous voltage drop in real time.
〈作 用〉
上述の方法によればリアルタイムで瞬時電圧低下の検出
を行なうことができる。<Operation> According to the method described above, instantaneous voltage drops can be detected in real time.
〈実施例〉
第1図は本発明を説明するためのブロック図であり、第
2図(a)、 (b)は第1図のものの動作を説明する
タイムチャートである。<Embodiment> FIG. 1 is a block diagram for explaining the present invention, and FIGS. 2(a) and 2(b) are time charts for explaining the operation of the device shown in FIG.
これらの図において、21は例えば送配電線2の電圧v
3が導びかれる入力端子、22は前記電圧Vs ヲ入カ
ドfルpLL回K、2311LIIg22の出力を同期
信号として基準電圧として基準正弦波v2を発生する基
準正弦波発生回路である。回路26の発生する基準正弦
波v2の波形は、第2図(a)に示す如く、端子21に
与えられる送配電線2の電圧Vsの公称値にあたる波形
Vsoからそのピーク値Vpにおけ名瞬時電圧低下検出
レベル値Vl、(例えば10%低下テノ検出テアレバ、
vIt=’ 0.I Vso )を差し引いた波形とし
て与えている。なお、Vs。In these figures, 21 represents the voltage v of the power transmission and distribution line 2, for example.
The reference sine wave generating circuit 22 generates a reference sine wave v2 using the output of the voltage Vs as a synchronizing signal and the output of the LIIg22 as a reference voltage. The waveform of the reference sine wave v2 generated by the circuit 26 is, as shown in FIG. Voltage drop detection level value Vl, (for example, 10% drop detection tear lever,
vIt=' 0. It is given as a waveform after subtracting I Vso ). In addition, Vs.
−竜が負になる区間T2では値を0としている。- The value is set to 0 in the interval T2 where the dragon becomes negative.
前記検出レベル値v2は回路23に内蔵した電圧低下巾
設定器26人の設定値を変更することにより任意に変更
できる。The detection level value v2 can be arbitrarily changed by changing the setting value of the voltage drop width setting device 26 built in the circuit 23.
24は前記基準正弦波v2の絶対値1v21を得る絶対
値変換回路、25は端子21に導入された電圧Vsの絶
対値1vSlを得る絶対値変換回路で、前記絶対値の差
(IVSl−IV21=ΔV2Q )をリアルタイムで
導出する。24 is an absolute value conversion circuit for obtaining the absolute value 1v21 of the reference sine wave v2, 25 is an absolute value conversion circuit for obtaining the absolute value 1vSl of the voltage Vs introduced into the terminal 21, and the difference in the absolute values (IVSl-IV21= ΔV2Q ) is derived in real time.
27は前記差ΔV20を入力とする瞬時電圧低下判別回
路で、1v=lがIV21よりも小さければ、送配電線
2の電圧が前記設定した電圧低下の規定値である10%
の低下範囲を超えたものとみて、瞬時電圧低下が生じた
と判断し、出力Uを発生する。これらで電圧低下検出部
が構成されている。27 is an instantaneous voltage drop determination circuit which inputs the difference ΔV20, and if 1v=l is smaller than IV21, the voltage of the power transmission and distribution line 2 is determined to be 10%, which is the specified voltage drop value set above.
It is determined that an instantaneous voltage drop has occurred, and an output U is generated. These constitute a voltage drop detection section.
上述の構成において、送配電線2の電圧が正常である場
合比較回路26からは差ΔV20において負値が導出さ
れることはなく、従って回路27から電圧低下の出力は
ない。In the above configuration, when the voltage of the power transmission/distribution line 2 is normal, a negative value is not derived from the comparison circuit 26 in the difference ΔV20, and therefore, there is no voltage drop output from the circuit 27.
ところが、落雷等により送配電線2に瞬低が発生すると
、送配電線2の電圧Vsが第2図(b)の如く低下する
。回路26は1v=l−1v21をリアルタイムで監視
しているところから、1V=1カ= l v21を下ま
わった時刻t1で直ちに出力ΔV20を検出し、瞬時電
圧低下判別回路27が瞬時電圧低下の出力Uを発する。However, when an instantaneous voltage drop occurs in the power transmission/distribution line 2 due to a lightning strike or the like, the voltage Vs of the power transmission/distribution line 2 drops as shown in FIG. 2(b). Since the circuit 26 monitors 1v=l-1v21 in real time, it immediately detects the output ΔV20 at time t1 when the voltage drops below 1V=1k=lv21, and the instantaneous voltage drop determination circuit 27 detects the instantaneous voltage drop. It emits an output U.
この様にして、入力電圧Vsの電圧低下がリアルタイム
で判別される。In this way, a voltage drop in the input voltage Vs is determined in real time.
また、もしも、入力電圧Vsにゼロクロス近傍で第2図
(b)の如くノイズNが重畳した場合でも、基準正弦波
の絶対値IV21を超えないので、誤動作することがな
い。Further, even if noise N is superimposed on the input voltage Vs near the zero cross as shown in FIG. 2(b), the absolute value IV21 of the reference sine wave will not be exceeded, so malfunction will not occur.
即ち、入力電圧Vsとこれの例えば90%波形とを単に
比較するのみでは、零クロス近傍のノイズによる誤動作
を避けることができないが、本発明ではピーク値点電圧
値Vpを常に差し引いたものを基準正弦波v2としてい
るので上述の如き誤動作を生じることはない。In other words, simply comparing the input voltage Vs with, for example, a 90% waveform thereof, cannot avoid malfunctions due to noise near the zero cross, but in the present invention, the voltage value Vp at the peak point is always subtracted as a reference. Since the sine wave v2 is used, the above-mentioned malfunction will not occur.
なお、基準正弦波発生回路25における基準正弦波v2
は、ROMを用いれば容易に得ることができる。また、
入−出力特性が第3図の様な特性曲線Gを有する回路に
よっても得ることができる。Note that the reference sine wave v2 in the reference sine wave generation circuit 25
can be easily obtained using a ROM. Also,
It is also possible to obtain a circuit whose input-output characteristics have a characteristic curve G as shown in FIG.
検出レベルLの変更は、これらの回路を差し換えたり、
可変部分を調整したりして簡単に行ない得る、
以上の説明では、入力電圧Vsが送配電線2の電圧であ
る場合について述べたが、本発明はこれに限定されるも
のではなく、その趣旨を損なわない限り、入力電圧Vs
がどの様な電圧であっても適用できる。To change the detection level L, replace these circuits,
This can be easily done by adjusting the variable parts. In the above explanation, the case where the input voltage Vs is the voltage of the power transmission and distribution line 2 has been described, but the present invention is not limited to this, and the gist thereof is as follows. As long as the input voltage Vs
It can be applied at any voltage.
〈発明の効果〉
以上の如く、本発明によれば、入力電圧の瞬時低下を時
間遅れを生じることなく検出でき、しかも入力電圧のゼ
ロクロス近傍におけるノイズ重畳によって誤動作を来た
すこともないという効果を生じる。<Effects of the Invention> As described above, according to the present invention, an instantaneous drop in input voltage can be detected without any time delay, and furthermore, there is an effect that malfunctions do not occur due to noise superimposition near the zero cross of the input voltage. .
第1図は本発明のブロック図、第2図(a)及び(b)
は第1図のものの各部のタイムチャート、第6図は基準
正弦波を得るための特性曲線の一例を示す図、第4図は
瞬時電圧低下装置の一例を示すブロック図、第5図は本
発明の一実施例を示すブロック図、第6図(a)及び(
b)は第5図のものの各部のタイムチャートである。
vS:入力電圧 Vso二公称値電圧Vλ:瞬時電
圧低下検出レベルの値
v2:基準電圧
27:瞬時電圧低下判別回路Fig. 1 is a block diagram of the present invention, Fig. 2 (a) and (b)
1 is a time chart of each part of the one shown in Fig. 1, Fig. 6 is a diagram showing an example of a characteristic curve for obtaining a reference sine wave, Fig. 4 is a block diagram showing an example of an instantaneous voltage drop device, and Fig. 5 is a diagram showing an example of the characteristic curve for obtaining a reference sine wave. Block diagrams showing one embodiment of the invention, FIGS. 6(a) and (
b) is a time chart of each part of the one shown in FIG. vS: Input voltage Vso2 nominal value voltage Vλ: Instantaneous voltage drop detection level value v2: Reference voltage 27: Instantaneous voltage drop discrimination circuit
Claims (1)
ける瞬時電圧低下検出レベルの値を常に差し引いて求ま
る波形を基準電圧の波形とし、この基準電圧の瞬時値の
絶対値と前記入力電圧の瞬時値の絶対値の差をリアルタ
イムで監視して前記入力電圧の瞬時電圧低下を検出する
様にしたことを特徴とする瞬時電圧低下検出方法。The waveform obtained by always subtracting the value of the instantaneous voltage drop detection level at the peak value point from the waveform corresponding to the nominal value of the input voltage is defined as the waveform of the reference voltage, and the absolute value of the instantaneous value of this reference voltage and the instantaneous value of the input voltage A method for detecting an instantaneous voltage drop, characterized in that an instantaneous voltage drop in the input voltage is detected by monitoring a difference in absolute values in real time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61313116A JPS63163177A (en) | 1986-12-25 | 1986-12-25 | Detection of momentary voltage drop |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61313116A JPS63163177A (en) | 1986-12-25 | 1986-12-25 | Detection of momentary voltage drop |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63163177A true JPS63163177A (en) | 1988-07-06 |
Family
ID=18037318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61313116A Pending JPS63163177A (en) | 1986-12-25 | 1986-12-25 | Detection of momentary voltage drop |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63163177A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0283460A (en) * | 1988-09-20 | 1990-03-23 | Kansai Electric Power Co Inc:The | Detection of voltage variation |
JPH02146939A (en) * | 1988-11-24 | 1990-06-06 | Nippon Electric Ind Co Ltd | High efficiency ac no-break power unit |
JP2003294791A (en) * | 2002-04-02 | 2003-10-15 | Tokyo Denshi Kk | Voltage drop detecting circuit for three-phase line |
JP2006242739A (en) * | 2005-03-03 | 2006-09-14 | Meidensha Corp | Voltage drop detection method and device by waveform comparison |
-
1986
- 1986-12-25 JP JP61313116A patent/JPS63163177A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0283460A (en) * | 1988-09-20 | 1990-03-23 | Kansai Electric Power Co Inc:The | Detection of voltage variation |
JPH02146939A (en) * | 1988-11-24 | 1990-06-06 | Nippon Electric Ind Co Ltd | High efficiency ac no-break power unit |
JP2003294791A (en) * | 2002-04-02 | 2003-10-15 | Tokyo Denshi Kk | Voltage drop detecting circuit for three-phase line |
JP2006242739A (en) * | 2005-03-03 | 2006-09-14 | Meidensha Corp | Voltage drop detection method and device by waveform comparison |
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